Fixed fixed point integer overflow on 32 bit systems

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added mingw cross compile makefile

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added external buffer and BGRA channel order to memory canvas

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added sample that draws to WinDOS window

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Added mingw output to .gitignore

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>